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Date: Thu, 9 Nov 2017 16:34:29 +0000 From: John Keeping <john@...anate.com> To: Felipe Balbi <balbi@...nel.org> Cc: linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org, Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Vincent Pelletier <plr.vincent@...il.com>, Jim Lin <jilin@...dia.com>, Janusz Dziedzic <januszx.dziedzic@...ux.intel.com>, John Keeping <john@...anate.com>, stable@...r.kernel.org Subject: [PATCH] usb: f_fs: Drop check on Reserved1 field on OS_DESC_EXT_COMPAT This check has gone through several incompatible variations in commits 53642399aa71 ("usb: gadget: f_fs: Fix wrong check on reserved1 of OS_DESC_EXT_COMPAT"), 354bc45bf329 ("usb: gadget: f_fs: Fix ExtCompat descriptor validation") and 3ba534df815f ("Revert "usb: gadget: f_fs: Fix ExtCompat descriptor validation"") after initially being introduced in commit f0175ab51993 ("usb: gadget: f_fs: OS descriptors support"). The various changes make it impossible for a single userspace implementation to work with different kernel versions, so let's just drop the condition to avoid breaking userspace. Fixes: 53642399aa71 ("usb: gadget: f_fs: Fix wrong check on reserved1 of OS_DESC_EXT_COMPAT") Cc: stable@...r.kernel.org # v4.7+ Signed-off-by: John Keeping <john@...anate.com> --- drivers/usb/gadget/function/f_fs.c | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/drivers/usb/gadget/function/f_fs.c b/drivers/usb/gadget/function/f_fs.c index 652397eda6d6..0d9962834345 100644 --- a/drivers/usb/gadget/function/f_fs.c +++ b/drivers/usb/gadget/function/f_fs.c @@ -2282,8 +2282,7 @@ static int __ffs_data_do_os_desc(enum ffs_os_desc_type type, int i; if (len < sizeof(*d) || - d->bFirstInterfaceNumber >= ffs->interfaces_count || - !d->Reserved1) + d->bFirstInterfaceNumber >= ffs->interfaces_count) return -EINVAL; for (i = 0; i < ARRAY_SIZE(d->Reserved2); ++i) if (d->Reserved2[i]) -- 2.15.0
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